SelfDataGuard v0.1.0-beta — open-source data-at-rest protection that survives DB exfiltration.

Released today as the second pillar of MySelf, paired with SelfRecover. The same May 2026 ANTS leak (~12M accounts in plaintext) made the case for both: SelfRecover protects authentication, SelfDataGuard
protects what's stored.

How it works (one line):
Per-user data master key, never stored in plain. Wrapped twice — once by Argon2id-derived key from password, once by HMAC-SHA256-derived key from a memorized secret (shared with SelfRecover via mathematical
context separation). Personal fields encrypted field-by-field with AES-256-GCM. Dump the DB → encrypted soup.

Three operational modes:

▸ Lite (default): server unwraps the master key in memory only during user sessions.

▸ Hybrid (e-commerce): operational fields admin-readable, sensitive fields zero-knowledge.

▸ Full (high-assurance): true zero-knowledge, all crypto in browser via WebCrypto.

Honest threat model — explicitly out of scope: compromised user endpoint (keyloggers, info-stealers), browser exploits, theoretical cryptanalysis of SHA-256 / AES-256-GCM / Argon2id, weak-password
bruteforce. The lib enforces password policy at deployment time.

Run the demo locally in 10 seconds:
git clone https://github.com/Pierroons/my-self
cd my-self/self-security/selfdataguard/demo && ./run.sh
(needs PHP 8.1+ with sodium + AES-NI capable CPU)

🧪 155 sanity tests, 0 failures. Includes a "DB dump = encrypted soup" end-to-end assertion that greps the SQLite file post-write to verify no plaintext leaks.

GPG-signed tag selfdataguard-v0.1.0-beta, release dated 2026-05-08.

Live demo (no signup, ephemeral data, public reset every night at 04:00 Europe/Paris):
https://dataguard.my-self.fr

Whitepaper EN: https://github.com/Pierroons/my-self/blob/main/self-security/selfdataguard/docs/whitepaper-en.md
Whitepaper FR: https://github.com/Pierroons/my-self/blob/main/self-security/selfdataguard/docs/whitepaper-fr.md
Repo: https://github.com/Pierroons/my-self/tree/main/self-security/selfdataguard
Release: https://github.com/Pierroons/my-self/releases/tag/selfdataguard-v0.1.0-beta

Companion to SelfRecover (https://bi-self.my-self.fr/selfrecover/). Same memorized secret unlocks both, mathematically isolated via HMAC contexts (/recover vs /dataguard). One word, two purposes.

Feedback especially welcome from people who have integrated Bitwarden / 1Password / ProtonMail-style envelope encryption in app-side multi-tenant setups. AGPL-3.0-or-later, no NDA, no commercial agenda —
community cryptographic review before v1.0.0.

#opensource #infosec #AGPL #privacy #selfhosted #cryptography #encryption #zerotrust #dataprotection

]]>https://board.circlewithadot.net/topic/5b7a5009-4b1f-478e-a503-8c8d2821c564/selfdataguard-v0.1.0-beta-open-source-data-at-rest-protection-that-survives-db-exfiltration.RSS for NodeFri, 15 May 2026 04:33:42 GMTFri, 08 May 2026 15:38:12 GMT60